David said that it was______ his strong interest in literature_____ he chose the course.

A．because of; that

B．because; so

C．because; that

D．why; because

下列关于原穴的叙述，错误的是（）。

A.经脉之气经过和留止部位的腧穴

B.阴经的原穴多分布在掌指关节之前

C.阳经的原穴多分布在腕踝关节之前

D.可以治疗各自所属脏腑病变

E.阴经的原穴就是五输穴中的输穴